Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Chapter 12

Work and Machines

work force exerted on an object that causes it to move
joule unit of work equal to one newton-meter
power the rate at which one form of energy is transferred into another object
machine a device that changes the amount of force exerted, the distance over which a force is exerted, or the direction in which the force is exerted
input force the force exerted on a machine
output force the force exerted on an object by a machine
input work the work done on a machine as the input force acts through the input distance
output work the work done by a machine as the output force acts through the output distance
mechanical advantage the number of times a machine increases a force exerted on it
efficiency the percentage of the input work that is converted to output work
inclined plane a simple machine that is a flat, sloped surface
wedge a simple machine that is an inclined plane that moves
screw a simple machine that is an inclined plane wrapped around a central cylinder to form a spiral
lever a simple machine that consists of a rigid bar that pivots about a fixed point
fulcrum the fixed point around which a lever pivots
wheel and axle a simple machine that consists of two attached circular or cylindrical objects that rotate about a common axis, each one with a different radius
pulley a simple machine that consists of a grooved wheel with a rope or cable wrapped around it
compound machine a device that combines two or more simple machines
Created by: KerriReynolds